Grinding and polishing machine.



J. AUBREY GRINDING AND POLISHING MACHINE.

APPLICATION FILED NOV. 10, I915.

Patented Mar. 14, 1916.

4 SHEETS-SHEET l.

THE COLUMBIA PLANOGRAPH co., WASHINGTON, n. c.

J. AUBREY.

GRINDING AND POLISHING MACHINE.

APPLICATION FILED NOV. I0. I9I5.

1,175,332. Patented Mar. 14,1916.

4 SHEETS-SHEET 2. 9.55

Tm: COLUMIUA ILANOGRAPII c0, WASHINGTON, n. c.

.I. AUBREY.

GRINDING AND POLISHING MACHINE.

APPLICATION men NOV. 10, I915.

1,175,332. Patented Mar.14,1916.

4 SHEETSSHEET 3.

J. AUBREY.

GRINDING AND POLISHING MACHINE.

APPLICATION FILED NOV.10. I915.

Patented Mar. 14, 1916.

4 SHEETS-SHEET 4.

|=iE COLUMBIA PLANOGRAPH cm. WASHINGTON. D. c.

JOHN AUBREY, F HARTFORD, CONNECTICUT.

GRINDING AND POLISHING MACHINE.

Specification of Letters Patent. Patented Liar, 14 1916,

Application filed November 10, 1915. Serial No. 60,722.

To all whom it may concern:

Be it known that 1, JOHN AUBREY, a citizen of the United States, residing at Hartford, in the county of Hartford and State of Connecticut, have invented a new and useful Improvement in Grinding and Polishing Machines, of which the following is a specification.

This invention relates to a machine that is adapted to grind and polish articles that are oval in transverse section, such as cutlery handles.

The object of the invention is to provide a simple and cheap automatic machine of this class into which table knives or like articles with metal or wooden handles may be readily placed and have their handles quickly ground and polished as satisfactorily as if they were presented and held to the grinding and polishing medium by hand.

While the invention may be embodied in machines for grinding as well as polishing articles, as it is particularly valuable when embodied in machines for polishing knife handles, it is herein described as designed for such purpose. In attaining this end the machine is provided with a slow rotating spindle having a chuck into which a knife blade may be readily thrust and clamped with its handle projecting, and the abrading material is applied to rapidly traveling endless belting which is moved into engagement with the handle of the knife held by the chuck. Mechanism is arranged to rotate the chuck mined number of revolutions, so that the sides of the handle with their broader surfaces will be turned against the belting longer than the edges with their narrower surfaces, and after the polishing is completed withdraw the belting and stop the handle from turning. When the starting treadle is depressed the belting carrier is swung into and locked in such position that the belting will travel in engagement with the knife handle, and this movement of the belting carrier causes a clutch to connect the chuck operating mechanism with the drive so that the knife handle will rotate. After a predetermined number of revolutions of the chuck with the knife handle engaged by the beltin the mechanisms are automatically tripped so as to release the lock and allow the belting to be withdrawn from the handle, and withdraw the clutch and stop the handle from rotating.

at a variable speed for a predeter- Figure 1 of the accompanying drawings is a front elevation of the machine provided with two endless polishing belts shown swung over out of polishing position. Fig. 2 shows a plan of the same. Fig. 3 shows a vertical section on the plane of dotted line 33 looking in the direction indicated by the arrows on Fig. 2. Fig. 4 shows a vertical section on the plane of dotted line 4-4 looking in the direction indicated by the arrows on Fig. 2; Fig. 5 is a section of the chuck holding a knife blade taken on the plane indicated by the dotted line 5-5 on Fig. 7. Fig. 6 is a plan of the chuck and knife. Fig. 7 shows a front end view of the chuck and knife. Fig. 8 is a section of the chuck on the ilane of the dotted line 8-8 on Fig. 7. Fig. 9 is a View, looking toward the front, of a portion of the mechanism for rotating the chuck spindle. Fig. 10 is a view of the chuck rotating mechanism look ing toward the rear. Fig. 11 is, on larger scale, a plan of the chuck spindle rotating mechanism and the clutch trip, with parts broken away. Fig. 12 shows views of the clutch pin. Fig. 13 is a section looking down on the plane indicated by the dotted line 13 13 on Fig. 1 showing the pin which is provided for holding the polishing belt up to its work.

The machine is illustrated as provided I with two endless polishing belts to which the abradmg and polishing material,car-

borundum, emery or the like, is applied.

If the machineis to be used for polishing thin handles there need be but one polishing bolt, but it is preferred, if thick handles are to be polished, to use two polishing belts arranged in the manner shown. Each of these belts 1 passes around a lower pulley 2 and an upper pulley 3, the former being keyed on a shaft 4 that is mounted in bearings fixed in the frame 5 and has a driving pulley 6, and the latter being mounted on a stud 7 that projects from a block 8 which is movable in a way in the upper end of a swinging arm 9. This block is adjustable up and down the arm by means of the screw 10 and hand wheel 11 for giving the desired tension to the polishing belt. \Vhen two polishing belts are provided a driving belt 12 may be passed from the source of power around both of the driving pulleys 6. The

swinging arm at its lower end is pivoted to the frame by a bolt 13 which passes through the lower end of the arm into the frame a,

little in toward the center of the machine from the plane that passes through the axes of the upper and lower pulleys. As the lower pulley has fixed bearings and the upper pulley is mounted on the swinging arm, when the top of the arm is swung toward the center of the machine into polishing position the polishing belt is tightened, and when the arm is swung out the polishin g belt is slackened. A spring 14: connected between the frame and the arm tends to pull the top of the arm over and keep the belt out of polishing position. In order to keep the polishing belt up to its work a pin 15 is arranged hack of it. This pin is mounted in a block 16 that is hinged. to a bracket 17 which is adjustably fastened to the arm so that the pin may be moved in or out and set. parallel or oblique to the face of the adjacent pulley. This pin is usually adjusted a little oblique so as to hold the outer edge of the belt up to the surface ofa tapering knife handle or outer end of a handle should the knife spring in the chuck. When the treadle 18, which is pivoted to the bottom of the frame, is depressed, the cables 19 draw the arms and swing the upper pulleys toward each other. WVhen these pulleys are so close that the belts will travel against the surface of the knife handle, a hook 20 on the end of the spring finger 21. that is adjust-ably fastened to one arm engages with the wall of the other arm and locks the two arms together.

The knife blade 81 is thrust into the chuck 22 so that its handle 23 will project forwardly between the polishing belts. This chuck may be formed by splitting the chuck spindle 2% and inserting in the front end. hardened plates 25 that are shaped to grip the bolster of the knife. To insure a tight grip the chuck may be provided with a cam 26 which, when its handle is turned to one position. contracts the chuck and when turned to another position releases the chuck so that the knife can be easily removed. Plates 66 are set in the chuck spindle across the division for the purpose of holding the knife blade central. (Figs. 5, 6, 7 and 8).

On the chuck spindlethere is a gear 27 meshing with which is a pinion 28 on a shaft 29, that on its rear end has a crank arm 30. This crank arm is slotted and traveling in the slot is a roll 31 on the end of a crank arm 32 that is loose on a spindle 33 keyed to which is the cone pulley 3%. The crank arm 32 has a pin 35 which is thrust by a spring 36 so that it tends to enter one of several recesses 37 in the face of the cone pulley (Fig. 11). V hen this pin projects into one of these recesses the cone pulley through the pin drives the cranks and through the pinion and gear rotates the chuck spindle. As the axis of the crank 32 is out of line with the axis of the crank arm 80, the crank 32 drives the crank 30 with a variable motion. The spindle of the cone pulley is supported in bearings in a yoke 38 that has forked ends and is fastened by bolts 39 to the back of the frame (Fig. 9). By loosening these bolts the yoke and pulley may be moved along so as to adjust the rela tion of the axis of the crank 32 to the axis of the crank 30, and thereby obtain the exact variable speed for the chuck spindle, wnich will cause the knife handle to turn the required amount faster when its edges are in contact with the polishing belts than when its sides are in contact with the polishing belts. to produce the desired result.

If the machine is idle and the arms hearing the polishing belts are apart a wedge finger 40 engages the clutch pin 85 and holds it out of engagement so that the crank 32 will not be turned by the rotation of the cone pulley. This finger is mounted on an arbor 41 which has a rocker arm 42 that is connected by a link a3 with a rocker arm 44: on an arbor 45 that at the front has an upwardly extending forked lever 46 (Fig. 11). When the arms bearing the polishing belts are thrown together by the depression of the treadle a finger n on the back of one arm engages and pushes a collar 48 on a rod 49 that is mounted in brackets 50 fastened to the top of the frame (Fig. l). As this rod is thus moved inward a collar 51 engages the lever 46 and through the linked rocker arms turns the wedge finger away from the clutch pin and allows it to enter one of the recesses so that the cone pulley will drive the cranks and rotate the chuck and knife. When the arms hearing the polishing belts are swung apart the finger 47 that projects from one arm engages a collar 52 loose'on the rod 49 and through the spring 53 and collar 54: pushes the rod outward (Fig. at). When the rod is pushed out the lever 4-6 is rocked and. this through the linked rocker arms turns the wedge finger into the path of the clutch pin so that when it comes around it will be withdrawn from the cone pulley and the cranks will then stop rotating the knife chuck.

Attached to the back face of the gear 27 on the chuck spindle is a cam' 55 that is adapted to engage a roll 56 on a lever 57 which at its lower end is hinged to the frame, and at its upper end is connected by a link 58 with an arm 59 that bears a pawl 60. The link is adjustably connected with the pawl arm so that the distance of the oscillatory movements of the pawl may be accurately determined (Fig. 3). The pawl is held in engagement with the teeth of a ratchet wheel 61, from the rear face of which a pin 62 projects. At each revolution of the ratchet wheel, the time of which may be varied by adjusting the movement of together the two arms which carry the polishing belts, and force the spring finger backwardlv out of engagement so that the two polishing belt arms will be drawn apart (Fig. 2).

The yoke which carries the cone pulley at the rear of the machine is adjusted to give the required variable speed to the chuck which will turn the knife handle so as to produce the best result. 'With the cone pulley and the polishing pulleys rotating, a. knife blade is thrust into the chuck and clamped, and the treadle depressed. The downward movement of the treadle, through the cables, swings the arms bearing the rapidly traveling polishing belts toward each other and into engagement with the surface of the knife handle to be polished. The movement of one of these polishing belt arms, as stated, through the rod, lever and linked crank arms turns the wedge linger out of the way of the clutch pin which it is holding, and allows the spring to throw the pin into such position that it will enter one of the recesses in the cone pulley, and then the cone pulley by engagement with this pin will through the cranks, pinion and gear turn the knife handle with a slow variable speed,the speed being faster as the edges of the handle come into engagement with the polishing belts and slower as the sides are engaged by the polishing belts. The handle is subiected to the action of the traveling polishing belts and is rotated between them until, through the cam and ratchet and pawl mechanism, the pin on the back of the ratchet wheel engages the lever and throws over the rocker arm at the front so as to cause it to release the latch which holds the two polishing pulley arms together. Then when the two polishing arms are released they are drawn apart so that the belts will be carried away from the handle. As this occurs one of the arms engages the rod in such manner that the wedge finger at the back will be swung around in position to be engaged by the clutch pin as the cranks come around and cause the withdrawal of the pin from the cone pulley, and thus stop the rotation of the handle.

The invention claimed is;

1. A polishing machine having a frame, a chuck for receiving the article to be polished. mechanism for rotating the chuck, an arm pivoted to the frame, a pulle carried by said arm, a pulley mounted on the frame between the pivot of said arm and the pulley carried by the arm, an endless polishing belt passing around said pulleys, means for rotating the pulley mounted on the frame and driving the polishing belt, and mechanism for swinging the arm and the pulley carried thereby and moving the polishing belt into and out of engagement with the article held by the chuck.

2. A polishing machine having a frame, a chuck for receiving the article to be polished, mechanism for rotating the chuck, a pair of arms pivoted to the frame, pulleys carried by said arms, pulleys mounted on the frame between the pivots of the arms and the pulleys carried by the arms, endless polishing belts passing around the pulleys, mechanism for swinging the arms toward each other, a catch on one arm adapted to engage the other arm and holding them in their inward positions with the polishing belts in engagement with the article held by the chuck, and mechanism for releasing the catch and allowing the arms with the pulleys and belts carried thereby to swing away fro-m each other.

3. A polishing machine having a frame, a chuck for receiving the article to be polished, mechanism for rotating the chuck at a variable speed, an endless polishing belt, means for driving the polishingbelt, and mechanism for swinging the polishing belt into and out of engagement with the article held by the chuck.

at. A polishing machine having a frame, a chuck for receiving the article to be polished, mechanism for rotating the chuck, a clutch for connecting the chuck and its rotating mechanism, an endless polishing belt, means for driving the polishing belt, and mechanism for swinging the polishing belt into engagement with the article held by the chuck and for causing the clutch to operatively connect the chuck with its rotating mechanism. 7

5. A polishing machine having a frame, a chuck for receiving the article to be polished, mechanism for rotating the chuck, a clutch for connecting the chuck and its rotating mechanism, an endless polishing belt, means for driving the polishing belt, mechanism for swinging the polishing belt into and out of engagement with the article held by the chuck, and mechanism actuated by the inward swing of the polishing belt for causing the clutch to connect the chuck with its rotating mechanism and actuated by the out ward movement of the polishing belt for causing the clutch to disconnect the clutch and its rotating mechanism.

6. A polishing machine having a frame, a chuck for receiving the article to be polished, mechanism for rotating the chuck at a variable speed, an arm pivoted to the frame, a pulley carried by said arm, a pulley mounted on the frame, an endless polishing belt passaround said pulleys, means for rotating the pulley carried by the frame and thus driving the polishing belt, means for swinging the arm toward and from the article held by the chuck, mechanism actuated by he arm during its upward movement for connecting the chuck and its rotating mechanism, and mechanism for stopping the chuck and causing the arm to swing away after a predetermined number of revolutions of the chuck.

7. A polishing machine having a frame, a chuck for receiving the article to be polished, mechanism for rotating the chuck at a variable speed, a pair of endless polishing belts, means for driving the polishing belts, mechanism for swinging the polishing belts toward and from each other, means for holdin the polishing belts up to the article held by the chuck, and means actuated by the chuck rotating means for releasing said belt holding means after a predetermined number of revolutions of the chuck.

8. A polishing machine having a frame, a chuck for receiving the article to be polished, mechanism for rotating the chuck at a variable speed, means for adjusting said chuck rotating mechanism so the speed may be changed, an endless polishing belt, means for driving the polishing belt, and mechanism for swinging the polishing belt into and out of engagement with the article held by the chuck.

9. A polishingmachine having a frame, a chuck for receiving the article to be polished, mechanism for rotating the chuck at a variable speed, a clutch for connecting the chuck and its rotating mechanism, an endless polishing belt, means for driving the polishing belt, and mechanism for swinging the polishing belt into engagement with the article held by the chuck and sinuiltaneously caus ing the clutch to operatively connect the chuck with its rotating mechanism.

10. A polishing machine having a frame, a chucl' for receiving the article to be polished,

mechanism for rotating the chuck at a variable speed, a clutch for connecting the chuck and its rotating mechanism, an endless polishing belt, means for driving the polishing belt, mechanism for swinging the polishing belt into and out of engagement with the article held by the chuck, and mechanism actuated by the inward swing of the polishing belt for causing the clutch to connect the chuck with its rotating mechanism and actuated by the outward movement of the polishing belt for causing the clutch to disconnect the chuck and its rotating mechanism.

11. A. polishing machine having a frame, a chuck for receiving the article to be polished, mechanism for rotating the chuck at a variable speed, a clutch for connecting the chuck with its rotating'mechanism, an end less polishing belt, means for driving the polishing belt, mechanism for swinging the polishing belt into and out of engagement with the article held by the chuck, mechanism actuated by the inward swing of the polishing belt for causing the clutch to connect the chuck with its rotating mechanism, mechanism actuated by the outward movement of the polishing belt for causing the clutch to disconnect the chuck and its rotating mechanism, and mechanism actuated after a predetermined number of revolutions of the chuck for causing the outward movement of the polishing belt.

12. A polishing machine having a frame, a chuck for receiving the article to be polished, mechanism for rotating the chuck at a variable speed, a clutch for connecting the chuck with its rotating mechanism, an endless polishing belt, means for driving the polishing belt, mechanism for swinging the polishing belt into engagement with the article held by the chuck, adjustable means for holding the polishing belt up to the article, and means for swinging the polishing belt out of engagement with the article.

JOHN AUBREY.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

